Preparation method for forming metal organic framework ZIF-67 film by utilizing cobalt nano array layer conversion

A technology of ZIF-67 and metal-organic framework, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of weak carrier binding force, difficulty in heterogeneous nucleation of metal-organic framework membrane, and easy cracking, etc. problem, to achieve the effect of less environmental pollution

Active Publication Date: 2016-01-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing a metal-organic framework ZIF-67 membrane, which solves the problems of difficulty in heterogeneous nucleation of the metal-organic framework membrane, weak binding force with the carrier, and easy brittleness

Method used

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  • Preparation method for forming metal organic framework ZIF-67 film by utilizing cobalt nano array layer conversion
  • Preparation method for forming metal organic framework ZIF-67 film by utilizing cobalt nano array layer conversion
  • Preparation method for forming metal organic framework ZIF-67 film by utilizing cobalt nano array layer conversion

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: In situ and green synthesis of a ZIF-67 film on an alumina ceramic tube using needle-like basic cobalt carbonate nanowire arrays.

[0035] (1) The carrier is an alumina ceramic tube carrier with an average pore diameter of about 0.1-2 μm. Before synthesis, use deionized water and ethanol to ultrasonically wash several times to remove surface particles and stains, and dry them for later use.

[0036] (2) Using 1mol / LNaOH and 1mol / LHNO respectively 3 Treat at 60°C for 2h, APTMS:C 2 h 5 OH=1:30(v:v) treated at 75°C for 3h, and dried at room temperature.

[0037] (3) The inner surface of the alumina ceramic tube introduces needle-like basic cobalt carbonate nanowire arrays: the molar ratio is Co(NO 3 ) 2· 6H 2 O:NaF:CO(NH 2 ) 2 :H 2 The solution of O=1:2:5:555 is a synthetic solution. The outer wall of the ceramic tube is tightly wrapped with polytetrafluoroethylene tape, suspended vertically in the kettle, reacted at 75°C for 12-24 hours, dried naturall...

Embodiment 2

[0040] Example 2: In situ and green synthesis of a ZIF-67 film on a single crystal silicon wafer by using rhombic cobalt oxyhydroxide nanorod arrays.

[0041] (1) The carrier is a single crystal silicon wafer, which is cut into a square silicon wafer of 15mm×15mm before use. Before synthesis, the carrier was placed in a beaker, cleaned ultrasonically with deionized water and ethanol, and dried at 60°C for later use.

[0042] (2) Introduce diamond-shaped cobalt fluoride hydroxide nanorod arrays on the silicon wafer: the molar ratio is Co(NO 3 ) 2 ·6H 2 O: NH 4 F: C 6 h 12 N 4 (hexamethylenetetramine): H 2 The solution of O=1:1.4:2:555 is the synthesis solution. Hang the treated silicon wafer in the kettle with a polytetrafluoroethylene tape, react at 75°C for 12-24 hours, dry it naturally, and rinse with deionized water , cobalt oxyhydroxide nanorod array layers are grown on both sides of the silicon wafer.

[0043] (3) Formation of the ZIF-67 film: use sandpaper to po...

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Abstract

The invention relates to a preparation method for forming a metal organic framework ZIF-67 film. Through hydrothermal synthesis, first a cobalt nano array layer firmly combined with a carrier is introduced to the carrier, and the carrier with the cobalt nano array layer is obtained; in the aftertreatment process, the cobalt nano array layer provides a metal source for growth of the ZIF-67 film and serves as a growing point and bonding point for forming the film, the continuous and uniform ZIF-67 film is formed by growth. According to the method, the problems that the metal organic framework film has difficulty in heterogeneous nucleation, is weak in binding force with the carrier and is easily subjected to embrittlement are solved. In the cobalt nano array growth process or in the ligand growth process, only water is used as a solvent, and no other organic solvent participates. The environmental pollution is small, and the preparation method conforms to the green chemical development requirements. In the film forming process, the cobalt nano array layer has dual functions of providing a metal cobalt source and enhancing binding force between the carrier and the ZIF-67 film.

Description

technical field [0001] The invention relates to a method for preparing a metal-organic framework ZIF-67 film by in-situ direct conversion of a cobalt compound nano-array layer, which solves the difficulty in heterogeneous nucleation of the metal-organic framework ZIF-67 film, weak binding force with a carrier, and easy brittle cracking The problem is that only water is used as the solvent synthesis system in the preparation process, and the environmental pollution is small. technical background [0002] Metal-organic framework membranes have the dual advantages of MOFs material performance and membrane structure characteristics. It is a new type of membrane material that has emerged and developed rapidly in recent years. It has shown outstanding performance in membrane processes such as gas separation, chiral separation, and pervaporation. Good and unique separation performance, has good potential application prospects, especially in gas membrane separation, MOFs membrane in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00
Inventor 张雄福张祥李雨佳刘海鸥
Owner DALIAN UNIV OF TECH
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